Most of those sort of things are people doing it as a prank on others, I don't know if it happens in women's public toilets but most men's loos have "Looking for hot young cock" type messages written all over the place with random phone numbers. I've done to it a few people

Dr. Bon BlossmanDo you know of anyone, maybe yourself, that has a problem with loud flatulence? Do your friends have trouble hearing over your loud booty toots? Try the FART SILENCER!All you need to do is when you feel a barking spider brewing, slip this colorful apparatus into your anus and BINGO - no audible trouser coughs! For added pleasure, spritz your favorite fragrance on a cotton ball, insert into the silencer, and turn your crop dusts into a breath of fragrant air for your friends!

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Obi Wan Kanobi said. "I have never seen such a wretched hive of scum and villainy." Little did Obi Wan realize he was describing the National party.